And just beyond the boundaries of the inner oasis, plants starved of water and nutrients struggle to survive.

The unusual garden, created by Landform Consultants and sponsored by by The UN Refugee Agency (UNHCR), is designed to make people stop and question how they view the plight of refugees.

It highlights the importance of providing shelter, both in the physical sense and from the psychological stresses of fleeing a conflict zone, offering protection and hope for a better future.

See the Border Control garden, and many others — including one that celebrates dogs and another that's an abstract interpretation of the universe — at the RHS Hampton Court Palace Show, from 5-10 July.